250+ TOP MCQs on Advantages of Combined Cycle Power Generation and Answers

Power Plant Engineering Multiple Choice Questions on “Advantages of Combined Cycle Power Generation”.

1. The overall plant efficiencies in case of a combined cycle power generation is?
a) Low
b) High
c) Very low
d) Very high
Answer: b
Clarification: It is practically possible to attain efficiencies near to 50% in case of a combined cycle power generation.

2. The investment cost related to the combined power generation is?
a) high
b) low
c) very high
d) none of the mentioned
Answer: b
Clarification: The investment cost related to the combined power generation is. This is because only 2/3 of the total output is produced in the gas turbine.

3. What % is the investment cost in Conventional steam power plant more than those in the combined cycle plants?
a) 10
b) 20
c) 30
d) 40
Answer: c
Clarification: The investment cost in Conventional steam power plant is 30% more than those in the combined cycle plants.

4. The amount of water required as coolant for a combined cycle plant is?
a) very high
b) less
c) medium
d) none of the mentioned
Answer: b
Clarification: The amount of cooling water required is only 40-50% of the steam power plant requirement.

5. Combined cycle plants have _____________ operation flexibility.
a) high
b) low
c) equal
d) very low
Answer: a
Clarification: The ease of operation, i.e, the ease with which the plant can be started and stopped is the operation flexibility.

6. Installations in stages is possible in Combined Cycle Plants.
a) true
b) false
Answer: a
Clarification: Because the gas turbines go into operation much sooner than the steam plants, installations in stages is possible in Combined Cycle plants.

7. Which of these has the most simple operation?
a) combined cycle plant
b) steam plant
c) combined cycle & steam plant
d) none of the mentioned
Answer: a
Clarification: Combined cycle plant is more flexible than the steam plant and so it has the simplest operation.

8. Combustion in a Combined cycle plant has ______ environmental impact.
a) serious
b) little/no
c) toxic
d) none of the mentioned
Answer: b
Clarification: As most of the processes of a combined cycle plant are degradable, so combustion in a combined cycle plant has no impact on the environment.

9. Cogeneration of heat & electricity is possible in a Combined cycle plants.
a) True
b) False
Answer: a
Clarification: One of the major advantages of a combined cycle plants is the cogeneration of heat & electricity.

10. Efficiency of Natural gas fired Combined cycle plants is more than that of coal-fired plants.
a) true
b) false
Answer: a
Clarification: As the efficiency of a combined cycle plant is high in comparison to that of steam power plant, naturally, the statement mentioned becomes true.